Circular looms



- May 29, 1956 J. CATRY ETAL CIRCULAR LOOMS 2 Sheets-Sheet 1 Filed Feb. 24, 1953 INVENTORS ML 717 M; L W

ATTQRNEYS CIRCULAR LOOMS 2 Sheets-Sheet 2 Filed Feb. 24, 1953 k @(QCZM.

ATTORNEYS United States Patent CKRCULAR LOOMS Jean Catry, Flixecourt, France, and Robert Norrie Low,

Dundee, Scotland, assignors to Fairwest (U. K.) Limited, London, England, a British company Application February 24, 1953, Serial No. 338,453

Claims priority, application Great Britain February 22, 1952 7 Claims. (Cl. 13913) This invention relates to a warp tension compensator system for use in circular looms whereby the tension of the warp threads may be maintained substantially constant so as to reduce the risk of warp breakages. For instance, when the shed is opening there is a general increase in the tension of a group of threads whilst, as the shuttle enters the shed, some of the threads are subjected to a further increase of tension.

According to the present invention, a Warp tension compensator system for a circular loom comprises a series of resiliently supported rollers over each of which passes a section of the warp threads on their way to the shedding mechanism, each of said rollers being so mounted as to be capable of movement transversely of said threads both as a whole and angularly of its supports.

Each roller may be mounted on the free end or ends of a rod capable of being rocked about its other ends against the action of springs or other resilient devices, such as rubber in a block of which the end of the rod may be mounted. The connection is preferably at the mid-point of the length of the roller and is such that the roller may rotate about the axis of the rod.

Each of the Warp threads may be arranged to pass through an eye in a drop pin, the arrangement being such that if the thread breaks the pin is released and falls into contact with an electrical contact in the circuit of the loom stop motion.

The invention will now be particularly described with reference to the accompanying drawings in which:

Fig. 1 is a sectional elevation of a compensator system with the addition of an accessory Warp stop motion device.

Fig. 2 is a plan corresponding to Fig. 1.

Fig. 3 is a sectional elevation of an alternative construction.

Fig. 4 is a sectional plan corresponding to Fig. 3.

Referring to Figs. 1 and 2 warp threads (Fig. 1) from the warp beam (not shown) extend over a smooth bar or roller 11, around a similar bar or roller 12 and over a compensating roller 26 towards the shedding device (not shown).

A metal and rubber bonded bush 21 is a drive fit in the housing 22 which is fulcrumed at 23. The spindle 24 is a drive fit in the inner metal shell of bush 21 and bears on the collar 25 of housing 22 so that any lateral movement of roller 26 is restrained by spring 27 anchored at 28. The bush 21 then only restrains axial movement of the spindle 24 and roller 26 due to the bonding of the rubber between the inner and outer metal shells. The spindle 24 is rigidly attached to collar 29 which carries centre roller spindle 30 around which rollers 26 rotate freely on bushes 32.

Figs. 3 and 4 illustrate a construction similar to that described with reference to Figs. 1 and 2, excepting that the roller 31 is curved to the general curvature of the loom and does not rotate, being fixed to the centre rod 24.

In addition to the group compensation of the warp 2,747,518 Fatented May 29, 1956 ice thread tension effected by the devices described above, it is advisable to provide means for compensating the tension of each individual thread, such means being so capable of use in connection with the loom stop motion.

A form of operating the loom stop motion is illustrated in Fig. l in which each warp thread 10 as it passes substantially horizontally from the bar 11 to the bar 12, passes through an eye 48 in a drop pin 47. The eye 48 forms the upper end of a slot 49 which fits over a guide bar 50 which extends around the loom.

An insulated contact bar 51 extending around the loom passes through a further slot 52 in the drop pin 47 and in its normal position the pin is insulated from the contact bar.

In the event of the breakdown of the thread 10 the stop pin 47 is allowed to fall, and makes contact with the exposed upper surface of the contact bar 51, thus completing the stop motion circuit and bringing the bar to rest.

We claim:

1. In a circular loom, a bar over which passes a section of the warp threads on their way to the shedding mechanism, a single supporting rod on which said bar is mounted, a spring acting on said supporting rod in one direction, and means for permitting movement of said rod in a direction angular to action of said spring.

2. In a circular loom, a bar over which passes a section of the warp threads on their way to the shedding mechanism, a single supporting rod on which said bar is mounted, a spring acting on said supporting rod, and resilient means connected to said supporting rod forming a journal bearing therefor whereby said supporting rod is capable of movement angularly of its longitudinal axis against the action of said resilient bearing means.

3. In a circular loom, a bar over which passes a section of the warp threads on their way to the shedding mechanism, a supporting rod on which said bar is mounted, a spring acting on said supporting rod, and a rubber block secured to said supporting rod and to a member fixed to the loom frame, said rubber block permitting movement of said supporting rod angularly of its longitudinal axis.

4. In a circular loom, a bar over which passes a section of the warp threads on their way to the shedding mechanism, a supporting rod on which said bar is mounted, a rubber block in which said rod is mounted and which is secured to a member fixed to the loom frame whereby said supporting rod is capable of movement angularly of its longitudinal axis, said bar being mounted on said supporting rod at one side of said rubber block, a link connected to said supporting rod at the opposite side of said rubber block to said bar, and a spring connected at one end to said link and at the other end to the loom frame.

5. A circular loom as defined in claim 4 in which said bar is connected to said supporting rod by a collar which carries a spindle on which said bar is mounted.

6. A circular loom as defined in claim 5 in which said bar is rotatably mounted on said spindle.

7. A circular loom as defined in claim 4 in which said bar is curved to the curvature of the loom.

References Cited in the file of this patent UNITED STATES PATENTS 381,720 Parker Apr. 24, 1888 1,693,517 Katterman Nov. 27, 1928 2,313,300 Pelee Mar. 9, 1943 2,398,547 Moessinger Apr. 16, 1946 2,507,828 Stephenson et al May 16, 1950 2,610,656 Watson Sept. 16, 1952 

